OUTAD Sport Bluetooth Headphones with Bluetooth 4.1, Balanced Audio, Built-in Mic, APT-X, CVC 6.0 Noise Cancellation TRAIN WITH THE BEST SOUND: enjoy dynamic, balanced sound with good bass performance that motivates you to run further and train harder. BLUETOOTH OPERATION: using bluetooth 4.1, the headphones use less battery power so you can enjoy up to 4.5 hours of play time. CVC NOISE CANCELLATION: reduce unwanted sounds and outside noise so nothing breaks your concentration. STABLE CONNECTIONS: Ergonomic design to specifically fit the contours of your ears, so they stay in place even when you are out doing rugged physical activity. WHAT YOU GET: OUTAD Sports Bluetooth Headphones, our guaranteed 12-month warranty and friendly customer service.